[mcstas-users] Frame overlap mirror creation

[Peter Kjær Willendrup]

Hi Andrew,

On 14 Jun 2021, at 10.04, Andrew Nelson <andyfaff at gmail.com<mailto:andyfaff at gmail.com>> wrote:

I saw that component mentioned on the user list before, but Pol_guide_mirror isn't present at the component list at http://www.mcstas.org/download/components/. Whilst it is present as a McStas component, the GUI doesn't seem to display properly (attached) so I don't know how to set it up.

Since it is not on the website is must be missing from the McStas 3 distribution, sorry about this.

I take it you are running a 2.x since it in fact exists on your system?

The Python mcdoc utility is a little picky wrt formatting of the documentation strings, you can try to run

mcdoc.pl Pol_guide_mirror
(or mcdoc-pl Pol_guide_mirror on windows)

In a terminal and see if this gives any more information?


Otherwise simply have a look at the top of the actual comp file, sits in your MCSTAS/optics folder :)

Best,

Peter



On Mon, 14 Jun 2021 at 17:21, Peter Kjær Willendrup <pkwi at fysik.dtu.dk<mailto:pkwi at fysik.dtu.dk>> wrote:
Hi Andrew,

On 14 Jun 2021, at 02.22, Andrew Nelson <andyfaff at gmail.com<mailto:andyfaff at gmail.com>> wrote:

I am wondering about the best way to create the frame overlap mirror in McStas. The FOM I need to create consists of a non-tapered rectangular guide (m=0 on top, m=3 on the sides, m=1 on the bottom) of 500 mm in length, 20 mm high, 50 mm wide. There is then a mirror (Ni, m=1) running down the length of this guide, running from the bottom of the guide at the front (-z) to the top of the guide at the back (+z)

I suggest taking a look at Pol_guide_mirror.comp which is intended for exactly this purpose. I admit it is a little confusing that the component is not named anything suggesting that it can be used like this. :)

I will consider making a name-change or an “alias” component to clear this up.

I couldn't find a previous example to go off. Would it be suitable to create a normal rectangular guide component with the host characteristics, then have a subsequent inclined mirror component that coincides with the host guide? Or would this confuse things?

How does one make composite optics components?

The thing is, one does not really… :)

There _are_ ways to do this with a set of independent mirrors and lots of logic / programming in the instrumentfile - but it gets long and complicated, writing a fresh component from scratch is probably easier.

That being said, the Union subsystem could eventually become a vehicle to implement “composite components” also for reflecting optics, but at the moment the focus in that code is on the physics of bulk material properties.


Best and hope this helps,
Peter

Peter Kjær Willendrup
Forskningsingeniør, Specialkonsulent
Næstformand for DTU Fysik LSU

DTU Physics


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Technical University of Denmark


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Department of Physics
Fysikvej
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pkwi at fysik.dtu.dk<mailto:pkwi at fysik.dtu.dk>



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Dr. Andrew Nelson


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